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Its a simple fact that in order to live we have to get oxygen into our blood. To this effect we inhale air into our lungs. But that in itself is not enough. Somehow the body has to get the oxygen that is in the air into our blood and in sufficient quatity. To do this our lungs have, over millenia evolved. each lung contains millions of liitle air sacs that look like bunches of grapes. These little air sacs are called alveoli. They act to increase the surface area of each lung and therefore increase the amount of blood that can absorb oxygen in one breath.

Together, the millions of alveoli of the lungs form a surface of more than 100 square meters. Within the alveolar walls is a dense network of tiny blood vessels called capillaries. The extremely thin barrier between air in our lungs and the capillaries allows oxygen to move from air in the alveoli into the blood and allows carbon dioxide to move from the blood in the capillaries into the alveoli. Without them the lungs would have to be many times larger than they actually are to absorb the amount of oxygen the body needs.

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Q: What are the Tiny air sacs that resemble grapes in the respiratory system?
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